Based off of the Riddler's most recent pokedex update, this

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Based off of the Riddler's most recent pokedex update, this is what Alola's pokedex will look like when accounting for old pokemon. I've only included Alolan forms that we know about, and colored them in blue. With those included, the older pokemon come up to about 253 pokemon

If we take a rough estimation of about 80 new pokemon, that means that we're going to have roughly 330-340 pokemon in the Alola pokedex.If I'm mathing right, that means in each individual pokedex category (Because they're doing kinda the same thing as Kalos, just splitting up between islands) that means each pokedex will have just under 90 pokemon in each.